fix: sometimes mime type is null. Use a default if so #11
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This pull request makes a minor improvement to the way image MIME types are determined in the
ImagesRouterclass. Instead of usingFiles.probeContentType, it now usesURLConnection.guessContentTypeFromName, providing a fallback to"image/png"if the type cannot be determined.ImagesRouterfromFiles.probeContentTypetoURLConnection.guessContentTypeFromName, improving reliability and adding a default fallback to"image/png"if the type is unknown.java.net.URLConnectionto support the new MIME type detection method.